Abrasive material and j



Ib all whom'it may concern: .Be it known that LNxruax C. Hannrsox;

. a citizen of the' United States of America and a residentof Xeyvtonville. in the county of Middlesex'and' Commonwealth of Massachusettsi have inventedcert-ain new and use 1Q r and the process of manufacturing the same,

ful- Improvements in Abrasive Materials and Methods of Making Same, of which the following is a specification.- This Invention relates to abrasive material the object of the invention being to produce artificially a material harder and tougher .than 'co'runduih and which is adapted for use as-a cutting or grinding agent.

The invention consists of a new material formed of diaspora-ground coke and ground, iron' fused together into a solid crystalline The invention further consists in theprop ess used in manufacturing said material which consists in mixing ground coke and iron with.diaspore,then-fusing the mixture in an electric furnace and finally allowing.

the fusedmass to slowly 'cool until crystaL' -li-zed.

'- theihaterial which will befullyunders'too The inve nt1on.;further consistsin certain variations m the process-of mannfactu'rin by reference to the descriptionof the operation ofmanufacture andto the claims to.

be hereinafter givern One preferred process-is herein described,

jtliisprocess haviu beenfound to give satisfactory and relia 1e results,- althouglrit is to. be understood that-the process "can be v varied in some partieularsand' that'the in-':

, -q.ui 'ed'quantity1of diaspore is taken and '.calcined in any suitable manner-until rev.

duced, to a powdered state.

p with the requiredquantity of coke "pre-v viously ground, and the required quantity 'of ground iron; 60.

' It has been such as cast iron borings'is" suitable for this -purose.- a 4 Yam thesethreematerials a have STATES. PA]

I mately as follows;

found that waste material ,Itiis' believed ,oFFIon I: n, or. Woman msacnosnzers.

H 'rnon or name emu.

' Bpiflqitlonot Letters Patent. Patented-Aug, 26, 1919. Anplication filed April 5, 191a, Berle! No. ease".

into a mass of fused aluminium oxid and .this then allowed to cool very slowly.

said mass s0lidif \'ing into crystalline form urin the cooling operation. 7

The amount of the three ingredients used to make a finished ton of abrasive is approx:-

3400 lbs. dia'spore.

'400. iron boriugs.

600 coke.

Obviously these proportions maybe varied to a certain extentwithout departing from the invention.

I Moreover. it is self apparent'tlmt by vary- 4 ing the time consumed in cooling the fused masstheproduct itself will be varied as the slower the product is cooled. the greater will be its toughness and abrasive power owing to the'fact that its crystallization will be'better defined;

' In any case the 'roduc't will have the same degree of hart ness.

The finished product will bea compact,

fine igrained mass free from pores making u an excellent'abrasive material harder and tougher than corundum and particularly adapted for use in .grinding.

ll'hile it is desirable to drive all the water out 'o'fthediaspore before placing it in the electric furnace.- a'very satisfactory result may be obtained by, drying the diaspore in p the electric furnace;

While the fused mass isbei'n cooled. it

may be agitated if desired thereby prevent mg too rapid crystallizat on and insuring -afiner gram tothe finished product.

' It- 'has been. found in practice that by means of this process a great saving in materials is made and the completed article may -be produced in much less time than by any This diaspo're 18 then thoroughly mixed" inasmuch as anarticle is produced therebyofflsuchfine grain that-it is superior for a. grinding agent to an known abrasive.

that t re operation and many advantages of the intention heread'ily understood without. further deseription.

' Having-"thus described my invention, 1

claimf 1.- An abrasive material composed of (11a,-

, spore, particles of ironuandc ground coke.

2. Anebrasivegmeterialcomposed of die.-

: spore-particles of-iron, and ground coke and [fused together.

Tie

mixture 3. An abrasive material poseol' ofe/ 'inixture of dicspore, ground coke, Tend ground cast iron horings.

4:. An abrasive, meter: 1 of e mixture of diespore, ground coke and ground.

cast iron horings electrically fused into a solid mass I 5. An abrasive materiel composed of a mixture; of approximately seventeen parts o'idiespore, two parts of ground coke, and.

three arts. of

un'cl cast iron horings.

diaspora, two parts of ground coke and. three parts of ground. cast'iron horings, all electrically fused into a solid mass.

- terial which consists in grinding-coke and particles ofi iron, mixing saiclground coke abrasive materiel composed. of a of approximately seventeen parts of 7 The process of abrasive me- I repel mixture in an electric furnace.

8. The process of making abrasive ma,-

terial which consists in grinding coke and particles of iron, mixing said. ground coke and iron with diaspore; then fusing the v 85 the tericl which consists in grinding coke and 40 I and iron with dicspor'e, fusing the mixture in an electric furnace, and then slowly cool-- ing the fused mess. I

10. The process of making abrasive Ina teriel which consists in calcining (liaspore, then mixing it with ground coke ancl iron, then fusing the mixturein an electric furmass. v v Signed hy me etc Post Ofiice Square, ,Boston, Mass, this'glth day of April, 1919.

NATHAN C. HARRISON.

Witnessesg WALTER E1. 'Lomnimn, NATHAN C. LO'MBARD.

nece and finellygslowly cooling the fused 

